Once you've settled on a lean cut of beef, remember portion sizes: a three-ounce piece of beef is about the size of a deck of cards. If you generally eat larger pieces, enjoy it less often or stretch it out by adding vegetables to a kabob or mix meat with pasta or rice.

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Your circulatory system is made up of your heart and three main types of blood vessels -- arteries, veins and capillaries. Your heart is at the center of the system, acting as a pump to distribute nutrient- and oxygen-rich blood through your body; it then takes away carbon dioxide and other waste your body doesn't need. Signs of poor circulation include cold hands and feet, numbness, dizziness, migraines, varicose veins and pain in your feet or legs. Untreated, poor circulation can lead to stroke, high blood pressure, kidney damage and other diseases. Learn more about your heart and circulatory system with expert advice from Sharecare.